Bizarre bug in Pythonista 3.4

upwart

I ran into a bizarre bug with the latest version of Pythonista.
It took me quite a long time to discover the cause of a Pythonista crash.
Here's a MWE (minimal working example), showing the bug:

from PIL import ImageFont, Image, ImageDraw
font = ImageFont.truetype(font="calibri.ttf", size=15)
im = Image.new("RGBA", (100, 100), (0, 0, 0, 0))
draw = ImageDraw.Draw(im)
draw.text(xy=(0, 0), text="a", font=font)
print("never reached")

In this script, a text is written into a Pillow message.
When I run this, the system crashes and the crash log shows:

Fatal Python error: Aborted

Current thread 0x000000016d847000 (most recent call first):
  File "/var/containers/Bundle/Application/A061EDB8-1B89-41D2-B706-1F4E042DE8E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/PIL/ImageFont.py", line 666 in getmask2
  File "/var/containers/Bundle/Application/A061EDB8-1B89-41D2-B706-1F4E042DE8E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/PIL/ImageDraw.py", line 429 in draw_text
  File "/var/containers/Bundle/Application/A061EDB8-1B89-41D2-B706-1F4E042DE8E4/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/PIL/ImageDraw.py", line 484 in text
  File "/private/var/mobile/Containers/Shared/AppGroup/11021B83-B419-4F67-A331-D54B9BAFC718/Pythonista3/Documents/salabim/a1_1.py", line 6 in <module>

Extension modules: pykit_io, _ui, _appex, _frameworksimporter, console, _debugger_ui (total: 6)

The strange thing is that this seems to happen only with this specific font (calibri.ttf) and only with font sizes between 13 and 17!
The code used to run fine on Python 3.3 and works well on all other platforms, I have used.

I found a workaround by using the Arial font instead of calibri.ttf. But it is very strange!

cvp

@upwart I don't have your font but I tried with another one without any problem.

Downloaded a calibri.ttf and same error

Error for size between 12 and 17 included, not 13 for me !!!???

upwart

@cvp
12 till 17 (including 13) causes crash here.

JonB

https://github.com/python-pillow/Pillow/issues/5033

@omz, take a look. Looks like maybe we need raqm?